JP2006147536A - Lighting system provided with reflection type collimator and image projection device adopting it - Google Patents

Lighting system provided with reflection type collimator and image projection device adopting it Download PDF

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JP2006147536A
JP2006147536A JP2005280396A JP2005280396A JP2006147536A JP 2006147536 A JP2006147536 A JP 2006147536A JP 2005280396 A JP2005280396 A JP 2005280396A JP 2005280396 A JP2005280396 A JP 2005280396A JP 2006147536 A JP2006147536 A JP 2006147536A
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light
light source
reflecting surface
optical path
incident
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JP4703338B2 (en
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Gye Hun Lee
啓 ▲ふん▼ 李
Dae-Sik Kim
大 式 金
Su-Gun Kim
洙 君 金
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Samsung Electronics Co Ltd
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/0994—Fibers, light pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0008—Reflectors for light sources providing for indirect lighting
    • F21V7/0016—Reflectors for light sources providing for indirect lighting on lighting devices that also provide for direct lighting, e.g. by means of independent light sources, by splitting of the light beam, by switching between both lighting modes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
    • G02B19/0066—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED in the form of an LED array
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S362/00—Illumination
    • Y10S362/80—Light emitting diode

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Projection Apparatus (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Microscoopes, Condenser (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system provided with a reflection type collimator and an image projection device adopting it. <P>SOLUTION: This lighting system is provided with a paraboloidal reflecting surface, a reflector provided with a light incident part and a light emitting part intersecting with each other, a light source irradiating the reflecting surface through the light incident part, a light source deviation compensation means interposed between the reflector and the light source and adjusting an image of the light source to a focus of the reflecting surface and a light path modification means guiding at least a part of light having a radiation angle smaller than an opening angle of the light emitting part to the reflecting surface. Thereby, efficiency for light utilization can be improved, and the small lighting system and the image projection device can be realized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、光を視準して照射する照明装置及びそれを採用した画像投射装置に関する。   The present invention relates to an illumination device that collimates and irradiates light, and an image projection device that employs the illumination device.

照明装置は、光源から放出される光を照明対象体に有効に照射される角度範囲で効率的に視準するために、レンズをはじめとする多様な形態のコリメータを採用している。   The illumination device employs various forms of collimators including a lens in order to efficiently collimate the light emitted from the light source within an angular range in which the illumination target is effectively irradiated.

一例として、画像投射装置は、光変調素子を照明するための照明装置を備える。照明装置の光源としては、メタルハライドランプや超高圧水銀ランプが使われる。メタルハライドランプや超高圧水銀ランプは、そのサイズが非常に大きくて照明装置が大型化されるという問題点がある。また、これらランプは、その寿命がせいぜい数千時間ほどである。したがって、家庭用として使われる場合に、ランプを頻繁に交換せねばならないとい不便さがある。このような問題を解決するために、光源として相対的に寿命が長い発光ダイオード（ＬＥＤ）などの小型光源を使用しようとする研究が進められつつある。   As an example, the image projection apparatus includes an illumination device for illuminating the light modulation element. A metal halide lamp or an ultra-high pressure mercury lamp is used as the light source of the lighting device. Metal halide lamps and ultra-high pressure mercury lamps have a problem that their size is very large and the lighting device is enlarged. Also, these lamps have a lifetime of several thousand hours at most. Therefore, when it is used for home use, there is an inconvenience that the lamp must be replaced frequently. In order to solve such a problem, researches are going on to use a small light source such as a light emitting diode (LED) having a relatively long lifetime as a light source.

ＬＥＤは、一般的にメタルハライドランプや超高圧水銀ランプに比べて、光量が少ない。したがって、画像投射装置の光源としては、複数のＬＥＤがアレイ化されたＬＥＤアレイが使われる。光を集光するためには、一般的にレンズを使用するが、この場合に、光効率が低下するという問題点がある。   LEDs generally have less light intensity than metal halide lamps or ultra-high pressure mercury lamps. Therefore, an LED array in which a plurality of LEDs are arrayed is used as the light source of the image projection apparatus. In order to condense light, a lens is generally used. In this case, however, there is a problem that the light efficiency is lowered.

図１及び図２を参照しつつ、光効率の低下をさらに詳細に説明する。近軸領域では、像のサイズと角度との積が保存される。したがって、ＬＥＤの発光面積と発光角度の立体角との積が保存量となり、これをエテンデューという。図１に示したように、一つのＬＥＤを使用する場合、ＬＥＤの発光面積ΦＬと立体角ＵＬとの積は、光変調素子の発光面積ΦＰと立体角ＵＰとの積と同一にできる。 The reduction in light efficiency will be described in more detail with reference to FIGS. In the paraxial region, the product of image size and angle is preserved. Therefore, the product of the light emission area of the LED and the solid angle of the light emission angle is the storage amount, which is called etendue. As shown in FIG. 1, when using a single LED, the product of the emission area [Phi L and solid angle U L of the LED is equal to the product of the emission area of the light modulation element [Phi P and solid angle U P Can be.

複数のＬＥＤをアレイ化して使用する場合には、図２に示したように、ＬＥＤアレイの発光面積ΣΦＬが一つのＬＥＤを使用する場合の発光面積ΦＬより大きくなる。このとき、ＬＥＤとＬＥＤアレイの発光角度の立体角ＵＬが同一であり、光変調素子の面積ΦＰは同一である。したがって、エテンデューが保存されるためには、ＬＥＤアレイを使用する場合に、光変調素子の発光角度の立体角ＵＰ’は、一つのＬＥＤを使用する場合に比べて大きくなる。投射レンズによって有効に投射される角度は、ＵＰであるので、ＵＰより大きい角度範囲の光は、投射レンズによって有効に投射されない。したがって、図２に示したような損失が発生して光効率を低下させ、結果的に、画像投射装置の輝度は、ＬＥＤアレイに使われるＬＥＤの数の増加にも拘わらず、上昇幅が制限される。
特開２００４−１０４０７７号公報 特開平９−９７９２７号公報 When using a plurality of LEDs in an array, as shown in FIG. 2, the light emission area ΣΦ L of the LED array is larger than the light emission area Φ L when one LED is used. At this time, the solid angle U L of the emission angle of the LED and the LED array are the same, the area [Phi P of the light modulation element are identical. Therefore, in order to preserve the etendue, when the LED array is used, the solid angle UP ′ of the light emission angle of the light modulation element becomes larger than when the single LED is used. Angle is effectively projected by the projection lens, because it is U P, light U P larger angular range are not effectively projected by the projection lens. Therefore, the loss as shown in FIG. 2 occurs to reduce the light efficiency. As a result, the brightness of the image projection apparatus is limited by the increase in the number of LEDs used in the LED array. Is done.
JP 2004-104077 A JP-A-9-97927

本発明が解決しようとする技術的課題は、光源から放射される光を効率的に視準できるように改善された照明装置及びそれを採用した画像投射装置を提供することである。   The technical problem to be solved by the present invention is to provide an illumination device improved so that light emitted from a light source can be efficiently collimated and an image projection device employing the illumination device.

前記課題を達成するための本発明の照明装置は、放物面状の反射面と、交互される入光部及び出光部を備える反射器と、前記入光部を通じて前記反射面に光を照射する光源と、前記反射器と前記光源との間に介在されて、前記光源の像を前記反射面の焦点に合わせる光源偏移補償手段と、前記出光部の開口角より小さい放射角度を有する光の少なくとも一部を前記反射面に案内する光路変更手段とを備える。   In order to achieve the above object, an illumination device according to the present invention includes a parabolic reflecting surface, a reflector having alternating light incident portions and light emitting portions, and irradiating the reflecting surface through the light incident portion. A light source, a light source deviation compensation unit that is interposed between the reflector and the light source and aligns an image of the light source with a focus of the reflection surface, and a light having a radiation angle smaller than an opening angle of the light emitting part Optical path changing means for guiding at least a part of the light guide to the reflecting surface.

前記課題を達成するための本発明の画像投射装置は、複数の光を照射する複数の照明装置と、前記複数の照明装置から入射された複数の光を画像データに合せて順次に変調する光変調素子と、前記光変調素子から出射された複数の光を拡大投射する投射レンズ装置とを備え、前記照明装置は、放物面状の反射面と、交互される入光部及び出光部を備える反射器と、前記入光部を通じて前記反射面に光を照射する光源と、前記反射器と前記光源との間に介在されて、前記光源の像を前記反射面の焦点に合わせる光源偏移補償手段と、前記出光部の開口角より小さい放射角度を有する光の少なくとも一部を前記反射面に案内する光路変更手段とを備える。   In order to achieve the above object, an image projection apparatus according to the present invention includes a plurality of illumination apparatuses that irradiate a plurality of lights, and a light that sequentially modulates a plurality of lights incident from the plurality of illumination apparatuses according to image data. A modulation lens and a projection lens device that magnifies and projects a plurality of lights emitted from the light modulation device, and the illumination device includes a parabolic reflection surface, alternating light incident portions and light exit portions. A reflector comprising: a light source that irradiates light to the reflecting surface through the light incident portion; and a light source shift that is interposed between the reflector and the light source so that the image of the light source is focused on the reflecting surface. Compensating means, and optical path changing means for guiding at least a part of the light having a radiation angle smaller than the opening angle of the light exiting portion to the reflecting surface.

一実施形態として、前記光源は、前記反射面の焦点に位置し、前記光源偏移補償手段は、中心が前記反射面の焦点に位置する球面レンズを備える。一実施形態として、前記光路変更手段は、前記球面レンズの前記出光部側の一部を傾斜して切断することによって形成される傾斜面を備える。   In one embodiment, the light source is located at the focal point of the reflecting surface, and the light source deviation compensating means includes a spherical lens whose center is located at the focal point of the reflecting surface. As one embodiment, the optical path changing means includes an inclined surface formed by inclining and cutting a part of the spherical lens on the light output part side.

一実施形態として、前記光源の光軸は、前記反射面の主軸と垂直になっている。   As one embodiment, the optical axis of the light source is perpendicular to the main axis of the reflecting surface.

一実施形態として、前記反射面は、円錐係数Ｋが−０.４ないし−２.５範囲の非球面である。   In one embodiment, the reflecting surface is an aspherical surface having a conical coefficient K in the range of -0.4 to -2.5.

本発明による照明装置及びそれを採用した画像投射装置によれば、光利用効率を向上させることができ、小型化された照明装置及び画像投射装置の具現が可能である。   According to the illumination device and the image projection device employing the illumination device according to the present invention, it is possible to improve the light use efficiency and to realize a miniaturized illumination device and image projection device.

以下、添付した図面を参照しつつ、本発明の望ましい実施形態を詳細に説明する。   Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

図３は、本発明による照明装置の一実施形態を示す断面図である。図３を参照するに、照明装置は、光源１０と反射器２０とを備える。反射器２０は、反射面２１と、入光部２２と、出光部２４とを備える。入光部２２と出光部２４とは、それぞれ異なる方向で反射面２１と対面し、かつ交互される。反射面２１は、放物面状である。ここで、放物面状とは、円錐係数Ｋ＝−１である厳密な放物面のみを意味するのではない。少なくとも本明細書で使われる反射面２１は、Ｋが−０.４ないし−２.５の範囲、望ましくは、−０.７ないし−１.６の範囲の非球面を意味する。反射面２１のＫ値は、光源１０から放射される光を照明しようとする対象体に有効に照明される放射角度範囲に視準するために、前記の範囲内で適切に選定される。以下では、Ｋ＝−１である反射面２１を例として説明する。   FIG. 3 is a cross-sectional view showing an embodiment of a lighting device according to the present invention. Referring to FIG. 3, the lighting device includes a light source 10 and a reflector 20. The reflector 20 includes a reflection surface 21, a light incident part 22, and a light exit part 24. The light entrance part 22 and the light exit part 24 face the reflective surface 21 in different directions and are alternated. The reflecting surface 21 has a parabolic shape. Here, the parabolic shape does not mean only a strict paraboloid having a conical coefficient K = -1. At least the reflecting surface 21 used in the present specification means an aspherical surface with K in the range of -0.4 to -2.5, preferably in the range of -0.7 to -1.6. The K value of the reflecting surface 21 is appropriately selected within the above range in order to collimate the radiation angle range in which the object to be illuminated is effectively illuminated with the light emitted from the light source 10. Below, the reflective surface 21 with K = −1 will be described as an example.

光源１０は、例えば、一つ以上のＬＥＤ１１を使用できる。光源１０は、入光部２２を通じて反射面２１に光を照射する。反射面２１による視準効果を高めるためには、光源１０は、反射面２１の焦点Ｆに位置せねばならない。言い換えれば、光源１０は、ＬＥＤ１１が反射面２１の焦点Ｆに位置するように設置されねばならない。しかし、光源１０の形状や反射器２０の形状などの制約によって、光源１０を反射面２１の焦点Ｆに位置させられない場合が発生することもある。   As the light source 10, for example, one or more LEDs 11 can be used. The light source 10 irradiates the reflecting surface 21 with light through the light incident portion 22. In order to enhance the collimation effect by the reflecting surface 21, the light source 10 must be positioned at the focal point F of the reflecting surface 21. In other words, the light source 10 must be installed so that the LED 11 is located at the focal point F of the reflecting surface 21. However, there are cases where the light source 10 cannot be positioned at the focal point F of the reflecting surface 21 due to restrictions such as the shape of the light source 10 and the shape of the reflector 20.

このような光源１０の焦点Ｆに対する位置偏移を補償するために、照明装置は、光源１０の像を焦点Ｆに合わせる光源偏移補償手段をさらに備える。図３には、光源偏移補償手段（光源偏移補償部）の一例として、透光体からなるレンズ３０が示されている。光源１０から放射された光は、レンズ３０を通過して反射面２１に入射される。レンズ３０の曲面３１は、反射面２１に入射される光の延長線（図３の点線）が反射面２１の焦点Ｆに集まるに適切な球面または非球面である。このような構成によって、光源１０があたかも反射面２１の焦点Ｆに位置して光を照射するのと同じ効果を得られる。光は、反射面２１で反射されて、主軸２６とほぼ平行な平行光に視準される。光は、出光部２４に出射される。厳密にいって、光源１０は、点光源となれない。したがって、“ほぼ平行光”とは、光源１０が事実上面光源であるので、全ての光が焦点Ｆから放出されるものではないため、光が完全な平行光とならないということを意味する。前述した実施形態では、光源１０がその光軸１３が主軸２６とほぼ垂直になるように配置されるが、これにより、本発明の範囲が限定されるものではない。   In order to compensate for such a positional shift of the light source 10 with respect to the focal point F, the illuminating device further includes light source deviation compensating means for aligning the image of the light source 10 with the focal point F. FIG. 3 shows a lens 30 made of a translucent material as an example of the light source deviation compensating means (light source deviation compensating unit). The light emitted from the light source 10 passes through the lens 30 and enters the reflecting surface 21. The curved surface 31 of the lens 30 is a spherical surface or an aspherical surface suitable for the extension line of light incident on the reflecting surface 21 (dotted line in FIG. 3) to gather at the focal point F of the reflecting surface 21. With such a configuration, the same effect can be obtained as when the light source 10 is positioned at the focal point F of the reflecting surface 21 and emits light. The light is reflected by the reflecting surface 21 and collimated to parallel light substantially parallel to the main axis 26. The light is emitted to the light exit unit 24. Strictly speaking, the light source 10 cannot be a point light source. Therefore, “substantially parallel light” means that since the light source 10 is actually a top surface light source, not all light is emitted from the focal point F, so that the light does not become completely parallel light. In the above-described embodiment, the light source 10 is arranged so that the optical axis 13 thereof is substantially perpendicular to the main axis 26, but this does not limit the scope of the present invention.

レンズ３０から出射される光のうち、反射面２１の焦点Ｆを基準として出光部２４の開口角Ｂより小さい放射角度の光Ｌ１は、反射面２１に入射されず、直ぐ出光部２４を通じて放出される。したがって、このような光Ｌ１は、視準されない。このように、視準されない光Ｌ１は、対象体を照明するために有効に使われず、損失される。したがって、光利用効率が低下する。   Of the light emitted from the lens 30, the light L <b> 1 having an emission angle smaller than the opening angle B of the light exit portion 24 with respect to the focal point F of the reflective surface 21 is not incident on the reflective surface 21 but is emitted through the light exit portion 24 immediately. The Therefore, such light L1 is not collimated. Thus, the non-collimated light L1 is not used effectively to illuminate the object and is lost. Therefore, the light use efficiency decreases.

このような損失光Ｌ１を減らすために、本実施形態の照明装置は、出光部２４の開口角Ｂより小さい放射角度の光を反射面２１に入射させるための光路変更手段を備える。図３及び図４には、光路変更手段（光路変更部）の一例として、レンズ３０を一部切断することによって形成される傾斜面４０が示されている。光源１０から出射された光Ｌ２は、レンズ３０に入射され、傾斜面４０を通じて出射される。このとき、図４に示したように、レンズ３０の屈折率と、レンズ３０と反射面２１との間の媒質（例えば、空気）の屈折率との差によって、光Ｌ２は、傾斜面４０を通過しつつ屈折されて、その経路が変更される。例えば、レンズ３０の屈折率を約１.５、空気の屈折率を約１であるとすれば、光Ｌ２は、傾斜面４０の法線Ｌ４から遠ざかる方向に屈折される。屈折された光Ｌ３は、反射面２１に入射される。このような構成によって、反射面２１によって視準される光量を増加させて光利用効率を向上させることができる。   In order to reduce such lost light L1, the illuminating device of the present embodiment includes an optical path changing unit for causing light having a radiation angle smaller than the opening angle B of the light output unit 24 to enter the reflecting surface 21. 3 and 4 show an inclined surface 40 formed by partially cutting the lens 30 as an example of the optical path changing means (optical path changing unit). The light L2 emitted from the light source 10 enters the lens 30 and is emitted through the inclined surface 40. At this time, as shown in FIG. 4, the light L <b> 2 passes through the inclined surface 40 due to the difference between the refractive index of the lens 30 and the refractive index of the medium (for example, air) between the lens 30 and the reflecting surface 21. It is refracted while passing through, and its path is changed. For example, if the refractive index of the lens 30 is about 1.5 and the refractive index of air is about 1, the light L2 is refracted in a direction away from the normal L4 of the inclined surface 40. The refracted light L3 is incident on the reflecting surface 21. With such a configuration, the amount of light collimated by the reflecting surface 21 can be increased, and the light utilization efficiency can be improved.

図５には、本発明による照明装置の他の実施形態が示されている。図５を参照するに、光源１０は、反射面２１の焦点Ｆに位置する。光源偏移補償手段の一例であるレンズ３０ａの曲面３１ａは、中心が焦点Ｆに位置する球面である。光路変更手段の一例である傾斜面４０ａは、レンズ３０ａを傾斜して切断することによって形成される。このような構成によって、図３及び図４で説明したような効果を得られる。   FIG. 5 shows another embodiment of a lighting device according to the present invention. Referring to FIG. 5, the light source 10 is located at the focal point F of the reflecting surface 21. The curved surface 31a of the lens 30a, which is an example of the light source deviation compensating means, is a spherical surface whose center is located at the focal point F. The inclined surface 40a, which is an example of the optical path changing means, is formed by inclining and cutting the lens 30a. With such a configuration, the effects described with reference to FIGS. 3 and 4 can be obtained.

前述したように、本発明による照明装置によれば、光源偏移補償手段をさらに備えることによって、照明装置の設計自由度を高めうる。また、光路変更手段をさらに備えることによって、光利用効率を向上させることができる。また、複数のＬＥＤを採用した光源１０を使用する場合に、レンズを利用せず、反射面２１を利用して、光を視準するため、図１及び図２で説明したような光利用効率の低下なしに高い効率で光を視準することができる。また、複数のＬＥＤを採用した光源１０を使用することによって、照明装置の小型化が可能である。   As described above, according to the illumination device of the present invention, the light source deviation compensation means is further provided, so that the design freedom of the illumination device can be increased. Moreover, the light utilization efficiency can be improved by further providing an optical path changing means. Moreover, when using the light source 10 which employ | adopted several LED, since a light is collimated using the reflective surface 21, without using a lens, light utilization efficiency as demonstrated in FIG.1 and FIG.2. It is possible to collimate light with high efficiency without a decrease in. Further, by using the light source 10 employing a plurality of LEDs, it is possible to reduce the size of the lighting device.

以下では、前述した照明装置を適用した画像投射装置について説明する。   Hereinafter, an image projection apparatus to which the above-described illumination device is applied will be described.

図６は、本発明による画像投射装置の一実施形態を示す構成図である。図６を参照するに、照明装置１００Ｒ，１００Ｇ，１００Ｂ、光変調素子２００、投射レンズ装置３００が示されている。照明装置１００Ｒ，１００Ｇ，１００Ｂは、それぞれ赤色（Ｒ）、緑色（Ｇ）、青色（Ｂ）光を放出する。各照明装置１００Ｒ，１００Ｇ，１００Ｂは、例えば、図３または図５に示したような構成を有する。光変調素子２００は、各照明装置１００Ｒ，１００Ｇ，１００Ｂから順次に放出される赤色、緑色、青色光を画像データに合せて順次に変調する。本実施形態の画像投射装置は、一つの反射型光変調素子２００を使用する単板式画像投射装置である。光変調素子２００としては、例えば、ＤＭＤ（デジタルマイクロミラーデバイス）が使用されうる。   FIG. 6 is a block diagram showing an embodiment of an image projection apparatus according to the present invention. Referring to FIG. 6, illumination devices 100R, 100G, and 100B, a light modulation element 200, and a projection lens device 300 are shown. The illumination devices 100R, 100G, and 100B emit red (R), green (G), and blue (B) light, respectively. Each of the lighting devices 100R, 100G, and 100B has a configuration as shown in FIG. 3 or FIG. 5, for example. The light modulation element 200 sequentially modulates red, green, and blue light sequentially emitted from the respective lighting devices 100R, 100G, and 100B in accordance with image data. The image projection apparatus of this embodiment is a single-plate image projection apparatus that uses one reflective light modulation element 200. As the light modulation element 200, for example, a DMD (digital micromirror device) can be used.

照明装置１００Ｒ，１００Ｇ，１００Ｂから順次に出射される赤色、緑色、青色光は、二色フィルタ４０１ａ，４０１ｂによって共通の光路に案内されてインテグレータ４０３に入射される。二色フィルタ４０１ａは、赤色光を反射させ、残りの光は透過させる。二色フィルタ４０１ｂは、青色光を反射させ、残りの光は透過させる。インテグレータ４０３は、均一な光度を有する面光を形成する。インテグレータ４０３としては、四角断面を有するガラスロードまたは内部反射面を有する光トンネルが採用される。コンデンシングレンズ装置４０２は、光を集光させてインテグレータ４０３に入射させる。インテグレータ４０３から出射された光は、ＴＩＲ（トータルインターナルリフレクション）プリズム４０５を経て、光変調素子２００に入射される。リレーレンズ装置４０４は、インテグレータ４０３から出射される光を光変調素子２００の開口に合せて拡大または縮少する。光変調素子２００は、赤色、緑色、青色光を画像情報に対応するように順次に変調させる。変調された光は、ＴＩＲプリズム４０５によって投射レンズ装置３００に案内される。投射レンズ装置３００は、変調された光をスクリーンＳに拡大投射する。   Red, green, and blue light sequentially emitted from the illumination devices 100R, 100G, and 100B are guided to a common optical path by the dichroic filters 401a and 401b and are incident on the integrator 403. The dichroic filter 401a reflects red light and transmits the remaining light. The dichroic filter 401b reflects blue light and transmits the remaining light. The integrator 403 forms surface light having a uniform luminous intensity. As the integrator 403, a glass road having a square cross section or an optical tunnel having an internal reflection surface is employed. The condensing lens device 402 collects the light and makes it incident on the integrator 403. The light emitted from the integrator 403 enters the light modulation element 200 through a TIR (total internal reflection) prism 405. The relay lens device 404 enlarges or reduces the light emitted from the integrator 403 according to the opening of the light modulation element 200. The light modulation element 200 sequentially modulates red, green, and blue light so as to correspond to image information. The modulated light is guided to the projection lens device 300 by the TIR prism 405. The projection lens device 300 enlarges and projects the modulated light onto the screen S.

前記のような画像投射装置によれば、光源偏移補償手段をさらに備える照明装置を採用することによって、照明装置及び画像投射装置の設計自由度を高めうる。また、光路変更手段をさらに備える照明装置を採用することによって、光利用効率を向上させることができる。また、放物面状の反射面２１を利用して光を視準することによって、複数のＬＥＤを採用した光源１０を採用する場合にも、光損失を減少ないし防止しうる。したがって、画像投射装置の輝度を高めうる。また、複数のＬＥＤを採用した光源１０を使用することによって、小型化された画像投射装置の具現が可能である。   According to the image projection apparatus as described above, the degree of freedom in designing the illumination apparatus and the image projection apparatus can be increased by adopting the illumination apparatus further provided with the light source deviation compensating means. Moreover, the light utilization efficiency can be improved by employing an illuminating device further provided with an optical path changing means. In addition, by collimating the light using the parabolic reflecting surface 21, even when the light source 10 employing a plurality of LEDs is employed, light loss can be reduced or prevented. Therefore, the brightness of the image projection apparatus can be increased. Further, by using the light source 10 employing a plurality of LEDs, it is possible to realize a miniaturized image projection apparatus.

本発明は、添付された図面に示された一実施形態を参考として説明されたが、これは、例示的なものに過ぎず、当業者ならば、これから多様な変形及び均等な他の実施形態が可能であることが分かるであろう。したがって、本発明の真の保護範囲は、特許請求の範囲によって決定されねばならない。   Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely illustrative, and various modifications and equivalent other embodiments will occur to those skilled in the art. You can see that is possible. Therefore, the true protection scope of the present invention must be determined by the claims.

本発明は、画像投射関連の技術分野に適用されうる。   The present invention can be applied to technical fields related to image projection.

レンズによる光利用効率の低下を説明する図である。It is a figure explaining the fall of the light utilization efficiency by a lens. レンズによる光利用効率の低下を説明する図である。It is a figure explaining the fall of the light utilization efficiency by a lens. 本発明による照明装置の一実施形態を示す断面図である。It is sectional drawing which shows one Embodiment of the illuminating device by this invention. 光路変更手段の作用を示す図である。It is a figure which shows the effect | action of an optical path change means. 本発明による照明装置の他の実施形態を示す断面図である。It is sectional drawing which shows other embodiment of the illuminating device by this invention. 本発明による画像投射装置の一実施形態を示す構成図である。It is a block diagram which shows one Embodiment of the image projection apparatus by this invention.

符号の説明Explanation of symbols

１０ 光源
１１ ＬＥＤ
１３ 光軸
２０ 反射器
２１ 反射面
２２ 入光部
２４ 出光部
２６ 主軸
３０ レンズ
４０ 傾斜面
Ｌ１，Ｌ３ 光
Ｆ 焦点
Ｂ 開口角 10 Light source 11 LED
13 Optical axis 20 Reflector 21 Reflecting surface 22 Light incident part 24 Light exiting part 26 Main axis 30 Lens 40 Inclined surfaces L1, L3 Light F Focus B Aperture angle

Claims (22)

放物面状の反射面と、交互される入光部及び出光部とを備える反射器と、
前記入光部を通じて前記反射面に光を照射する光源と、
前記反射器と前記光源との間に介在されて、前記光源の像を前記反射面の焦点に合わせる光源偏移補償手段と、
前記出光部の開口角より小さい放射角を有する光の少なくとも一部を前記反射面に案内する光路変更手段とを備える照明装置。 A reflector comprising a parabolic reflecting surface and alternating light incident and exit portions;
A light source that irradiates the reflective surface with light through the light incident portion;
A light source deviation compensating means interposed between the reflector and the light source, for aligning the image of the light source with the focal point of the reflecting surface;
An illumination device comprising: an optical path changing unit that guides at least a part of light having an emission angle smaller than an opening angle of the light output unit to the reflection surface. 前記光源は、前記反射面の焦点に位置し、
前記光源偏移補償手段は、中心が前記反射面の焦点に位置する球面レンズであることを特徴とする請求項１に記載の照明装置。 The light source is located at the focal point of the reflective surface;
The illumination device according to claim 1, wherein the light source deviation compensating means is a spherical lens whose center is located at a focal point of the reflecting surface. 前記光路変更手段は、前記球面レンズの前記出光部側の一部を傾斜して切断することによって形成される傾斜面を備えることを特徴とする請求項２に記載の照明装置。   The lighting device according to claim 2, wherein the optical path changing unit includes an inclined surface formed by inclining and cutting a part of the spherical lens on the light output part side. 前記光源の光軸は、前記反射面の主軸と垂直になっていることを特徴とする請求項１ないし３のうち何れか一項に記載の照明装置。   4. The illumination device according to claim 1, wherein an optical axis of the light source is perpendicular to a main axis of the reflection surface. 前記反射面は、円錐係数Ｋが−０.４ないし−２.５の範囲の非球面であることを特徴とする請求項１ないし３のうち何れか一項に記載の照明装置。   4. The lighting device according to claim 1, wherein the reflection surface is an aspheric surface having a conical coefficient K in a range of −0.4 to −2.5. 5. 前記光源は、一つ以上のＬＥＤを備えることを特徴とする請求項１ないし３のうち何れか一項に記載の照明装置。   The lighting device according to claim 1, wherein the light source includes one or more LEDs. 複数の光を照射する複数の照明装置と、前記複数の照明装置から入射された複数の光を画像データに合せて順次に変調する光変調素子と、前記光変調素子から出射された複数の光を拡大投射する投射レンズ装置と、を備え、前記照明装置は、
放物面状の反射面と、交互される入光部及び出光部とを備える反射器と、
前記入光部を通じて前記反射面に光を照射する光源と、
前記反射器と前記光源との間に介在されて、前記光源の像を前記反射面の焦点に合わせる光源偏移補償手段と、
前記出光部の開口角より小さい放射角を有する光の少なくとも一部を前記反射面に案内する光路変更手段とを備えることを特徴とする画像投射装置。 A plurality of illumination devices that irradiate a plurality of lights, a light modulation element that sequentially modulates a plurality of lights incident from the plurality of illumination devices according to image data, and a plurality of lights emitted from the light modulation elements A projection lens device for enlarging and projecting, the illumination device,
A reflector comprising a parabolic reflecting surface and alternating light incident and exit portions;
A light source that irradiates the reflective surface with light through the light incident portion;
A light source deviation compensating means interposed between the reflector and the light source, for aligning the image of the light source with the focal point of the reflecting surface;
An image projection apparatus comprising: an optical path changing unit that guides at least a part of light having an emission angle smaller than an opening angle of the light output unit to the reflection surface. 光源は、前記反射面の焦点に位置し、
前記光源偏移補償手段は、中心が前記反射面の焦点に位置する球面レンズであることを特徴とする請求項７に記載の画像投射装置。 The light source is located at the focal point of the reflecting surface;
The image projection apparatus according to claim 7, wherein the light source deviation compensation unit is a spherical lens whose center is located at a focal point of the reflection surface. 前記光路変更手段は、前記球面レンズの前記出光部側の一部を傾斜して切断することによって形成される傾斜面を備えることを特徴とする請求項８に記載の画像投射装置。   The image projection apparatus according to claim 8, wherein the optical path changing unit includes an inclined surface formed by inclining and cutting a part of the spherical lens on the light output part side. 前記光源の光軸は、前記反射面の主軸と垂直になっていることを特徴とする請求項７ないし９のうち何れか一項に記載の画像投射装置。   The image projection apparatus according to claim 7, wherein an optical axis of the light source is perpendicular to a main axis of the reflection surface. 前記反射面は、円錐係数Ｋが−０.４ないし−２.５の範囲の非球面であることを特徴とする請求項７ないし９のうち何れか一項に記載の画像投射装置。   10. The image projection apparatus according to claim 7, wherein the reflection surface is an aspheric surface having a conical coefficient K in a range of −0.4 to −2.5. 前記光源は、一つ以上のＬＥＤを備えることを特徴とする請求項７ないし９のうち何れか一項に記載の画像投射装置。   The image projection apparatus according to claim 7, wherein the light source includes one or more LEDs. 光源から照射される光を視準する照明装置において、
前記光源から照射される光を出光部に反射させる反射面と、
前記光源の像を前記反射面の焦点に対する位置偏差を補償する光源偏移補償手段と、
前記光源から照射される光のうち、前記反射面に入射されていない範囲の光を前記反射面に入射されるように案内する光路変更手段とを備える照明装置。 In an illumination device that collimates light emitted from a light source,
A reflecting surface that reflects the light emitted from the light source to the light emitting portion;
Light source deviation compensation means for compensating a positional deviation of the image of the light source with respect to the focal point of the reflecting surface;
An illumination device comprising: an optical path changing unit that guides light in a range not incident on the reflecting surface out of the light emitted from the light source so as to be incident on the reflecting surface. 前記光源偏移補償手段は、前記反射面の焦点付近に位置するレンズを備え、前記レンズの曲面は、前記レンズを通過して前記反射面に入射される光の延長線が前記焦点に集まるように決定されることを特徴とする請求項１３に記載の照明装置。   The light source deviation compensating means includes a lens positioned in the vicinity of the focal point of the reflecting surface, and the curved surface of the lens is such that an extended line of light incident on the reflecting surface passing through the lens is collected at the focal point. The lighting device according to claim 13, wherein the lighting device is determined as follows. 前記光路変更手段は、前記レンズの曲面の一部に設けられる傾斜面を備えることを特徴とする請求項１４に記載の照明装置。   The lighting device according to claim 14, wherein the optical path changing unit includes an inclined surface provided on a part of a curved surface of the lens. 前記光源偏移補償手段は、中心が前記反射面の焦点に位置する球面レンズであることを特徴とする請求項１３に記載の照明装置。   14. The illumination device according to claim 13, wherein the light source deviation compensating means is a spherical lens whose center is located at the focal point of the reflecting surface. 前記光路変更手段は、前記球面レンズの前記出光部側の一部を傾斜して切断することによって形成される傾斜面を備えることを特徴とする請求項１６に記載の照明装置。   The illumination device according to claim 16, wherein the optical path changing unit includes an inclined surface formed by inclining and cutting a part of the spherical lens on the light output part side. 前記光源偏移補償手段と前記光路変更手段とは、一体に形成されることを特徴とする請求項１３に記載の照明装置。   The lighting device according to claim 13, wherein the light source deviation compensating unit and the optical path changing unit are integrally formed. 前記反射面で反射されて前記出光部に出射される光は、前記反射面の主軸と実質的に平行になっていることを特徴とする請求項１３に記載の照明装置。   The illuminating device according to claim 13, wherein the light reflected by the reflecting surface and emitted to the light output portion is substantially parallel to a main axis of the reflecting surface. 放物反射面と、入光部及び出光部とを備える反射器と、
前記入光部を通じて前記放物反射面に光を照射する光源と、
前記光源と前記放物反射面との間に介在されるものであって、前記光源の像を前記反射面の焦点に合わせる光源偏移補償部と、前記光源から照射される光のうち、前記放物反射面に入射されない範囲の光を屈折させて、前記放物反射面に入射させる光路変更部とを備える光学手段とを備える照明装置。 A reflector comprising a parabolic reflecting surface, a light incident portion and a light exit portion;
A light source that irradiates the parabolic reflecting surface with light through the light incident portion;
A light source shift compensator that is interposed between the light source and the parabolic reflecting surface and aligns an image of the light source with a focus of the reflecting surface; An illuminating apparatus comprising: an optical unit including an optical path changing unit that refracts light in a range not incident on the parabolic reflecting surface and causes the light to enter the parabolic reflecting surface. 前記光路変更部は、前記光偏移補償部に設けられる傾斜面であることを特徴をする請求項２０に記載の照明装置。   21. The illumination device according to claim 20, wherein the optical path changing unit is an inclined surface provided in the light shift compensation unit. 特定色相の光を照射する一つ以上の光源と、
前記一つ以上の光源に対応して光を視準して反射させる反射面と、前記光源の前記反射面の焦点に対する位置偏差を補償する光源偏移補償部と、前記光源から照射される光のうち、前記反射面に入射されていない範囲の光を屈折させて、前記反射面に入射させる光路変更部と、を備える光学手段と、
前記視準された光を画像データに合せて順次に変調する光変調素子と、
前記光変調素子から出射された複数の光を拡大投射する投射レンズ装置とを備えることを特徴とする画像投射装置。 One or more light sources that emit light of a specific hue;
Reflecting surface for collimating and reflecting light corresponding to the one or more light sources, a light source deviation compensating unit for compensating a positional deviation of the light source with respect to the focus of the reflecting surface, and light emitted from the light source An optical path changing unit that refracts light in a range not incident on the reflecting surface and makes the light incident on the reflecting surface;
A light modulation element that sequentially modulates the collimated light according to image data;
An image projection device comprising: a projection lens device that enlarges and projects a plurality of lights emitted from the light modulation element.
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